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 Cornwall-On-Hudson
 Code of Ordinances
 Part II. General Legislation
 Chapter 165. Water
 Article II. Cross-Connection Control

  § 165-27. Determination of type of backflow protection device.  

Latest version.
  • A. 
    Categories; rating system; regulation.
    (1) 
    An acceptable backflow prevention device must be installed in every service connection to a facility. Three categories shall be considered when determining the degree of hazard posed by a facility and making the subsequent determination of the type of protection device required. The Department recognizes the threat to the public water system arising from cross-connections. All threats will be classified by degree of hazard and will require the installation of approved reduced pressure principle backflow prevention devices "reduce pressure zone assembly" (RPZA) or "double-check valve assembly (DCVA). They are:
    (a) 
    Use, toxicity and availability of contaminants within the premises.
    (b) 
    Availability of a supplementary supply of water.
    (c) 
    Fire-fighting system evaluation.
    (2) 
    Based on these considerations, the Water Superintendent shall rate a facility as hazardous, aesthetically objectionable or nonhazardous. A hazardous facility must be contained through the use of an RPZA or properly designed air gap.
    (3) 
    An aesthetically objectionable facility must be contained through the use of a DCVA.
    (4) 
    Nonhazardous facilities should be protected through an internal plumbing control program to ensure that plumbing cross-connections are adequately protected or eliminated.
    B. 
    The Water Superintendent or designee shall determine the type of device required for each property and facility. In making this determination, the Water Superintendent may utilize the Sample List of Facilities Requiring Backflow Prevention, prepared by the Department of Health and, if necessary, shall consult with the Orange County Department of Health.
    C. 
    Cross-connection control by facility type.
    (1) 
    Hazardous types of facilities which shall require installation of an approved reduce pressure zone assembly (RPZA) or air gap in the service connection to the public water distribution system include, but are not limited to:
    (a) 
    Sewage and industrial wastewater treatment plants and pumping stations and sewer flushers.
    (b) 
    Paper manufacturing or processing, dye plants, petroleum processing, printing plant, chemical manufacturing or processing, industrial fluid systems, steam generation, rubber processing and tanneries.
    (c) 
    Canneries, breweries, food processing, milk processing, ice manufacturing, meat packers, poultry processing and rendering companies.
    (d) 
    Hospitals, clinics, laboratories, veterinary hospitals, mortuaries and embalmers.
    (e) 
    Metal plating, photo processing, laundries, commercial car washes, commercial refrigeration systems and dry-cleaning establishments.
    (f) 
    Commercial greenhouses, spraying and irrigation systems using weedicides, herbicides and exterminators.
    (g) 
    Boiler systems, cooling towers or internal fire-fighter systems using conditioners, inhibitors and corrosion control chemicals.
    (h) 
    Residential units with lawn and irrigation system with chemical injection.
    (i) 
    Residential units or facilities with service provided by both the village water distribution system and private well or water supply.
    (2) 
    Aesthetically objectionable types of facilities which shall require installation of an approved double-check valve in the service connection of the public water distribution system are those which include, but are not limited to:
    (a) 
    Customer fire protection loops and fire storage tanks with no chemical additives.
    (b) 
    High temperature potable water.
    (c) 
    Utilization for food grade dyes.
    (d) 
    Complex plumbing systems in commercial buildings, such as but not limited to beauty salons, churches, apartment buildings, gas stations, supermarkets, nursing homes, construction sites and carnivals.
    (e) 
    Residential units with lawn and irrigation systems.
    (3) 
    The above lists are not all-inclusive. The type of backflow prevention device required for each facility shall be determined by the Water Superintendent or designee as set forth above.
    (4) 
    Residential dual-check valves.
    (a) 
    Effective the date of the adoption of the cross-connection control program, all new residential buildings will be required to install a residential dual-check device immediately downstream of the water meter. Installation of this residential dual-check device on a retrofit basis on existing service lines will be instituted at a potential cost to the homeowner's expense.
    (b) 
    The owner must be aware that installation of a residential dual-check valve results in a potential closed plumbing system within his residence. As such, provisions may have to be made by the owner to provide for thermal expansion within his closed loop system, i.e., the installation of thermal expansion devices and/or pressure relief valves.
    (5) 
    Strainers. The Department strongly recommends that all new retrofit installation of reduced pressure principle devices and double-check valve backflow preventers include the installation of strainers located immediately upstream of the backflow device, except on fire lines. The installation strainers will preclude the fouling of backflow devices due to both foreseen and unforeseen circumstances occurring to the water supply system, such as water main repairs, water main breaks, fires, periodic cleaning and flushing of mains, etc. These occurrences may "stir up" debris within the water main that will cause fouling of backflow devices installed without the benefit of strainers. No strainer is to be used on a fire line without the approval of the insurance underwriters having jurisdiction.
Amended 1-25-1999 by L.L. No. 1-1999